Populate Select box dynamically by ajax in Cakephp

To populate a select box by cakephp ajax functionality.
Step 1.
In the end of your view (.ctp)file.This is your javascript code in cake.

<?php
$this->Js->get('#select1')->event('click', 
$this->Js->request(array('controller'=>'ControllerName','action'=>'ajax_call'), array(
'update'=>'#select2',
'async' => true,
'method' => 'post',
'dataExpression'=>true,
'data'=> $this->Js->serializeForm(array(
'isForm' => true,
'inline' => true))
))
);
?>

Step 2.
In your controller file create function with that returns options string

public $helpers = array('Js'); //load Js helper
public function getBySubject(){
	
		$this->autoRender=false; //prevent to load default layout
$option;		
//your code
		printf($option);
		}

step 3.
In the end or your layout file after your loaded scripts

<?php
if (class_exists('JsHelper') && method_exists($this->Js, 'writeBuffer')) echo $this->Js->writeBuffer();
// will write your cached scripts
?>
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Detect Mousewheel events by jQuery

$(function () {
   var isChrome = !!window.chrome && !!window.chrome.webstore; //use to resolve browser compatibilty issue.
   var functionname="mousewheel.focal";
   if(!isChrome)
	functionname="DOMMouseScroll";
   $('Selector').bind(functionname, function{
	var delta = (isChrome) ? e.delta || e.originalEvent.wheelDelta : e.originalEvent.detail;
        if(isChrome && delta < 0){
	     //scroll down in chrome
	 }
        elseif(isChrome && delta > 0){
            //scroll up in chrome
	}
        elseif(!isChrome && delta > 0){
            //scroll down in mozilla
	}
        else{
            //scroll up in mozilla
	}
	return false;
    });
});

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Insert form details to database and then redirect to Paypal using javascript in php

<!--insert into database-->
<?php 
if(isset($_POST['submit'])){
$email=$_POST['email'];
$amount=$_POST['amount'];
$sql = "INSERT INTO payment(emailid , pay_amount) VALUES('".$email."','".$amount."')"; 
$result=$mysqli_query($conn, $sql);
}
?>

<!--form-->
<form method="post" action="">
<input type="email" name="email">
<input type="text" name="amount">
<button name="submit">Pay</button>
<?form>

<!--paypal form-->
<form id="paypal_submit_form" action="https://www.sandbox.paypal.com/cgi-bin/webscr"  method="post">
<input type="hidden" name="add" value="1">
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="business" value="yourbusinessid@b.com">
<input type="hidden" name="item_name" value="Donation">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="action" value="formaction">
<input type="hidden" name="email" id="emailid"  value="<?php echo $_POST['email'];?>" >
<input type="hidden" id="amountid" name="amount"  value="<?php echo $_POST['amount'];?>" >
</form>

<!--Javascript-->
<script type="text/javascript">
document.getElementById("paypal_submit_form").submit();
</script>
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